<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>5_对象相关知识</title>
</head>
<body>
    <script type="text/javascript">
       let a = 'name'

       let obj = {}
       obj[a] = 'tom'
       console.log(obj) // {name: 'tom'}


    </script>
</body>
</html>